diff --git a/source/app/InputStream.cpp b/source/app/InputStream.cpp
index ebc10d3..9a6c83a 100755
--- a/source/app/InputStream.cpp
+++ b/source/app/InputStream.cpp
@@ -191,6 +191,7 @@ Bool InputStream::open( QString filename, UInt width, UInt height, Int input_for
   m_cStreamInformationString.append( "] " );
   m_cStreamInformationString.append( QFileInfo( m_cFilename ).fileName() );
 
+  m_iCurrFrameNum = -1;
   seekInput( 0 );
 
   m_cTimer.start();
@@ -319,7 +320,7 @@ Void InputStream::readNextFrame()
   UInt64 bytes_read = 0;
   //m_cTimer.restart();
 
-  if( m_iCurrFrameNum + 1 >= ( Int )m_uiTotalFrameNum )
+  if( m_iCurrFrameNum + 1 >= (Int64)m_uiTotalFrameNum )
   {
     m_iErrorStatus = LAST_FRAME;
     m_pcNextFrame = NULL;
@@ -370,8 +371,7 @@ Void InputStream::setNextFrame()
   else
   {
     m_iErrorStatus = END_OF_SEQ;
-    m_iCurrFrameNum = 0;
-    seekInput( m_iCurrFrameNum );
+    seekInput( 0 );
   }
 }
 
@@ -393,7 +393,7 @@ Void InputStream::seekInput( UInt64 new_frame_num )
 {
   if( !m_pFile )
     return;
-  if( new_frame_num < 0 || new_frame_num >= m_uiTotalFrameNum )
+  if( new_frame_num < 0 || new_frame_num >= m_uiTotalFrameNum || (Int64)new_frame_num == m_iCurrFrameNum )
     return;
 #ifdef USE_FFMPEG
   if( m_cLibAvContext.getStatus() )
diff --git a/source/app/InputStream.h b/source/app/InputStream.h
index 721f99e..24bb5a2 100755
--- a/source/app/InputStream.h
+++ b/source/app/InputStream.h
@@ -78,7 +78,7 @@ private:
   UInt m_uiHeight;
   UInt m_uiFrameRate;
   UInt64 m_uiTotalFrameNum;
-  Int m_iCurrFrameNum;
+  Int64 m_iCurrFrameNum;
 
 public:
   InputStream();
diff --git a/source/app/plaYUVerApp.cpp b/source/app/plaYUVerApp.cpp
index 1e18254..c3cdb20 100644
--- a/source/app/plaYUVerApp.cpp
+++ b/source/app/plaYUVerApp.cpp
@@ -103,10 +103,10 @@ Void plaYUVerApp::about()
 {
   QString about_message;
   about_message.append( "The <b>plaYUVer</b> is an open-source raw video player! " );
-  about_message.append("Developed by ");
-  about_message.append("João Carreira ");
-  about_message.append("and ");
-  about_message.append("Luís Lucas");
+  about_message.append( "Developed by " );
+  about_message.append( "João Carreira " );
+  about_message.append( "and " );
+  about_message.append( "Luís Lucas" );
   QMessageBox::about( this, "About plaYUVer", about_message );
 }
 
@@ -305,15 +305,25 @@ Void plaYUVerApp::updatePropertiesSelectedArea( QRect area )
 
 // -----------------------  Playing Functions  --------------------
 
-UInt plaYUVerApp::getMaxFrameNumber()
+UInt64 plaYUVerApp::getMaxFrameNumber()
 {
   UInt currFrames;
-  UInt maxFrames = INT_MAX;
-  for( Int i = 0; i < m_acPlayingSubWindows.size(); i++ )
+  UInt64 maxFrames = INT_MAX;
+  if( m_pcCurrentSubWindow )
   {
-    currFrames = m_acPlayingSubWindows.at( i )->getInputStream()->getFrameNum();
-    if( currFrames < maxFrames )
-      maxFrames = currFrames;
+    if( m_acPlayingSubWindows.contains( m_pcCurrentSubWindow ) )
+    {
+      for( Int i = 0; i < m_acPlayingSubWindows.size(); i++ )
+      {
+        currFrames = m_acPlayingSubWindows.at( i )->getInputStream()->getFrameNum();
+        if( currFrames < maxFrames )
+          maxFrames = currFrames;
+      }
+    }
+    else
+    {
+      maxFrames = m_pcCurrentSubWindow->getInputStream()->getFrameNum();
+    }
   }
   return maxFrames;
 }
@@ -374,7 +384,7 @@ Void plaYUVerApp::play()
     {
       m_acPlayingSubWindows.append( m_pcCurrentSubWindow );
       m_pcCurrentSubWindow->seekAbsoluteEvent( m_acPlayingSubWindows.at( 0 )->getInputStream()->getCurrFrameNum() );
-      m_pcFrameSlider->setMaximum( getMaxFrameNumber() - 1 );
+      updateTotalFrameNum();
     }
     m_pcCurrentSubWindow->play();
   }
@@ -436,6 +446,7 @@ Void plaYUVerApp::stop()
       seekSliderEvent( 0 );
     }
   }
+  updateTotalFrameNum();
 }
 
 Void plaYUVerApp::playEvent()
@@ -457,6 +468,13 @@ Void plaYUVerApp::playEvent()
         updateFrameProperties();
         return;
       }
+      else
+      {
+        for( Int i = 0; i < m_acPlayingSubWindows.size(); i++ )
+        {
+          m_acPlayingSubWindows.at( i )->seekAbsoluteEvent( 0 );
+        }
+      }
       break;
     case -3:
       m_acPlayingSubWindows.at( i )->close();
@@ -487,11 +505,12 @@ Void plaYUVerApp::updateCurrFrameNum()
     m_pcCurrFrameNumLabel->setText( "1" );
   }
 }
-Void plaYUVerApp::updateTotalFrameNum( UInt total_frame_num )
+Void plaYUVerApp::updateTotalFrameNum()
 {
-  if( m_pcCurrentSubWindow && m_pcCurrentSubWindow->getInputStream() && total_frame_num == 1 )
+  UInt64 total_frame_num = 1;
+  if( m_pcCurrentSubWindow && m_pcCurrentSubWindow->getInputStream() )
   {
-    total_frame_num = m_pcCurrentSubWindow->getInputStream()->getFrameNum();
+    total_frame_num = getMaxFrameNumber();
   }
   m_pcFrameSlider->setMaximum( total_frame_num - 1 );
   m_pcTotalFrameNumLabel->setText( QString( tr( "%1" ) ).arg( total_frame_num ) );
@@ -1133,7 +1152,7 @@ Void plaYUVerApp::writeSettings()
   settings.setMainWindowPos( pos() );
   settings.setMainWindowSize( size() );
   settings.setLastOpenPath( m_cLastOpenPath );
-  settings.setSelectedTool( (Int)m_appTool );
+  settings.setSelectedTool( ( Int )m_appTool );
   settings.setPlayingSettings( m_arrayActions[VIDEO_LOOP_ACT]->isChecked(), m_arrayActions[VIDEO_LOCK_ACT]->isChecked() );
 }
 
diff --git a/source/app/plaYUVerApp.h b/source/app/plaYUVerApp.h
index e61aa0c..d2a4aed 100644
--- a/source/app/plaYUVerApp.h
+++ b/source/app/plaYUVerApp.h
@@ -121,11 +121,11 @@ private:
   Void zoomToFitAll();
 
   //! Playing functions
-  UInt getMaxFrameNumber();
+  UInt64 getMaxFrameNumber();
   Void startPlay();
   Void setTimerStatus();
   Void updateCurrFrameNum();
-  Void updateTotalFrameNum( UInt total_frame_num = 1 );
+  Void updateTotalFrameNum();
 
   Void updateMenus();
   Void updateStreamProperties();